[PATCH 4/8] hw/acpi/pcihp: Add forced slot unplug helper

[Dongli Zhang <dongli.zhang@xxxxxxxxxx>]

Add acpi_pcihp_device_force_unplug_cb() to complete PCI slot removal
through the existing ACPI PCI hotplug eject path.

Forced unplug intentionally does not introduce a separate teardown
sequence. It lets management trigger the same slot completion helper that
is already reachable when the guest writes the ACPI EJ register.

Signed-off-by: Dongli Zhang <dongli.zhang@xxxxxxxxxx>
---
 hw/acpi/acpi-pci-hotplug-stub.c |  6 ++++++
 hw/acpi/pcihp.c                 | 17 +++++++++++++++++
 include/hw/acpi/pcihp.h         |  3 +++
 3 files changed, 26 insertions(+)

diff --git a/hw/acpi/acpi-pci-hotplug-stub.c b/hw/acpi/acpi-pci-hotplug-stub.c
index d58ea726a8..9451a45c0b 100644
--- a/hw/acpi/acpi-pci-hotplug-stub.c
+++ b/hw/acpi/acpi-pci-hotplug-stub.c
@@ -30,6 +30,12 @@ void acpi_pcihp_device_unplug_request_cb(HotplugHandler 
*hotplug_dev,
 {
 }
 
+void acpi_pcihp_device_force_unplug_cb(HotplugHandler *hotplug_dev,
+                                       AcpiPciHpState *s, DeviceState *dev,
+                                       Error **errp)
+{
+}
+
 void acpi_pcihp_reset(AcpiPciHpState *s)
 {
 }
diff --git a/hw/acpi/pcihp.c b/hw/acpi/pcihp.c
index 87162ff2c0..7a1f2b873a 100644
--- a/hw/acpi/pcihp.c
+++ b/hw/acpi/pcihp.c
@@ -367,6 +367,23 @@ void acpi_pcihp_device_unplug_request_cb(HotplugHandler 
*hotplug_dev,
     acpi_send_event(DEVICE(hotplug_dev), ACPI_PCI_HOTPLUG_STATUS);
 }
 
+void acpi_pcihp_device_force_unplug_cb(HotplugHandler *hotplug_dev,
+                                       AcpiPciHpState *s, DeviceState *dev,
+                                       Error **errp)
+{
+    PCIDevice *pdev = PCI_DEVICE(dev);
+    int slot = PCI_SLOT(pdev->devfn);
+    int bsel = acpi_pcihp_get_bsel(pci_get_bus(pdev));
+
+    if (bsel < 0) {
+        error_setg(errp, "Unsupported bus. Bus doesn't have property '"
+                   ACPI_PCIHP_PROP_BSEL "' set");
+        return;
+    }
+
+    acpi_pcihp_eject_slot(s, bsel, 1U << slot);
+}
+
 bool acpi_pcihp_is_hotpluggable_bus(AcpiPciHpState *s, BusState *bus)
 {
     Object *o = OBJECT(bus->parent);
diff --git a/include/hw/acpi/pcihp.h b/include/hw/acpi/pcihp.h
index efce5fd2e1..13c131b8e8 100644
--- a/include/hw/acpi/pcihp.h
+++ b/include/hw/acpi/pcihp.h
@@ -75,6 +75,9 @@ void acpi_pcihp_device_unplug_cb(HotplugHandler *hotplug_dev, 
AcpiPciHpState *s,
 void acpi_pcihp_device_unplug_request_cb(HotplugHandler *hotplug_dev,
                                          AcpiPciHpState *s, DeviceState *dev,
                                          Error **errp);
+void acpi_pcihp_device_force_unplug_cb(HotplugHandler *hotplug_dev,
+                                       AcpiPciHpState *s, DeviceState *dev,
+                                       Error **errp);
 
 void build_acpi_pci_hotplug(Aml *table, AmlRegionSpace rs, uint64_t 
pcihp_addr);
 void build_append_pci_dsm_func0_common(Aml *ctx, Aml *retvar);
-- 
2.43.5